Copying the pattern of jdbc/transaction*, I tried this:
(defn blah [func] (func))
(defn load-exp [file timestamp filehash matrix]
(blah
(fn [] (dorun (map identity matrix)))))
which also consumes the heap.
Can anyone explain to me what's happening here? Something about creating a
anonymous function?
On Tuesday, September 10, 2013 5:24:44 PM UTC-7, Brian Craft wrote:
>
> It seems to be something about the jdbc/transaction macro. If I rewrite
> load_exp so it does nothing but walk the seq, it still consumes the heap:
>
> (defn load-exp [file timestamp filehash matrix]
> (jdbc/transaction
> (dorun (map identity matrix))))
>
>
> If I remove the jdbc/transaction call, it's fine.
>
> (defn load-exp [file timestamp filehash matrix]
> (dorun (map identity matrix)))
>
>
>
> On Tuesday, September 10, 2013 3:24:29 PM UTC-7, Brian Craft wrote:
>>
>> Trying jhat now, reference chain here:
>>
>> --> cavm.h2$load_exp$fn__165@0x2aaab4b04660 (56 bytes) (field matrix:)
>> --> clojure.lang.LazySeq@0x2aaab4b05388 (48 bytes) (field s:)
>> --> clojure.lang.Cons@0x2aaab4b0fe08 (48 bytes) (field _more:)
>> --> clojure.lang.LazySeq@0x2aaab4b10330 (48 bytes) (field s:)
>> --> clojure.lang.Cons@0x2aaab6543ec0 (48 bytes) (field _more:)
>>
>> This looks to me like the head is being retained as a parameter to a
>> function. load_exp signature is like so:
>>
>> defn load-exp [file timestamp filehash matrix]
>>
>> But surely passing a seq to a function doesn't retain the head?
>>
>> Here's the body of the function:
>>
>> (defn load-exp [file timestamp filehash matrix]
>> (kdb/transaction
>> (let [cid (merge-cohort file)
>> exp (merge-exp file (format-timestamp timestamp) filehash cid)
>> sids (load-samples cid (:samples (meta matrix)))]
>> (load-exp-samples exp sids)
>> (load-exp-matrix exp matrix))))
>>
>>
>> load-exp-matrix calls (dorun (map)) on matrix. There's one other
>> reference here, where we pull the metadata. Does any of this retain the
>> head?
>>
>> On Tuesday, September 10, 2013 2:36:29 PM UTC-7, Brian Craft wrote:
>>>
>>> From jmap output it's pretty clear I'm retaining the head of a seq
>>> somehow, but I have no idea how, or where. Is there any way to find the
>>> reference, besides staring at code waiting for enlightenment?
>>>
>>
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